This is a list of software (SaaS, PaaS, IaaS, etc.) and other offerings that have free tiers for developers.
You may also be interested in ...
MirageJs
Mirage JS is an API mocking library that lets you build, test and share a complete working JavaScript application without having to rely on any backend services.
Shuffle
This little js library helps you categorize, sort, and filter a responsive grid of items.
Animated CSS burger component
These burgers are available as plain html/css or as React components. This burger component is part of the Dashboard UI Kit 3.0.